The search string rvaddonmsi+visual+studio+2015+download+upd does not correspond to any known, official Microsoft component or popular open-source Visual Studio extension. The term rvaddonmsi appears to be a non-standard, potentially custom or legacy identifier. There is for this specific term from Microsoft or trusted repositories (NuGet, GitHub, Visual Studio Marketplace).
: Essential for running apps built with VS 2015. Available from the Microsoft Download Center Microsoft Report Viewer 2015 Runtime : Often identified by rvaddon.msi in installation logs, it can be downloaded from the Microsoft Download Center (requires .NET Framework 4.0 or higher). Support Warning rvaddonmsi+visual+studio+2015+download+upd
: A common root cause is that your Windows system lacks the latest Microsoft certificates required to verify the digital signature of the .msi file. Open certmgr.msc . : Essential for running apps built with VS 2015
❌ – these are often malware, outdated, or broken. Open certmgr